Bending-chamber fire box



Jan. 10, 1928.

L. D. BLACKSHERE BENDING CHAMBER FIRE BOX Filed March 16, 1925 .III

INVE N T U 1:1 Lea/ia D. Bloc/mb ere. za/m' ATT UHNEY patente& Jan. 10, 1928.

UNITED STATES PATEWT GFFICE.

LEVISD. BLACKSHERE, OF CHARLESTON, "WEST VIRGHWA ASIGNOR [EC]` THE LIBBEY- OWENS SHEET GLASS COMPANY, OJ? TOLEDO, Oi -HU, .ti. GOES BENDlNG-UTEIAMBER FIJRVE BMX.

Application filed March 16;

'The present in ve ntion relates to sheet glass apperatus, :unt has particular reference e; tvi ie ot' apperatus wherein a sheet, is initia lly drzwn in n vertical plane and is bent over u detlecting' nenber to a horizontal plane.

All iniportzint object ot the inventon is to provide appnratus of this nature inciud ng inenns ,tor heating: the sheet as it is being; detiected tron one plane to another.

it 'further object to provide a sheet glase drawing app uratus wherein a sheet is continuously drawn :tron a source ot molten ;gl-ass, the said sheet being nitially started in a vertical plane, etter which it is bent over a suitable detlecting member into a horizontal plane, said npperatus including: ineans tor radiating heat upon the sheet as it s bent to prevent brealage of the sheet during the detiectingmovement ther-ect.

%till another object is to provide means ;tor heating a sheet of glass which is being.: deflectcd from one plane to another by placing a heat radiating pl ate between that portion ot' the sheet being' bent and suitable heatzine; means.

Other objects and advantages of the :invention will become appnrent during the course ot the following description.

the drawing' shows a fruencntarv Verticat longg'itudinal section through a type ot apparatus in which the invention may be used.

The type of machine illustrated that disciosed in the Colburn Potent 1341-8309, granted Dec. 4-, 1917, wherein a tenk :tui-nate l containing a source ot molten glass is provided. The batch of ingredients used in the gluss is introduced within the tanh 1 at one end where thev are subjected to an intense hcet to n'ielt and unike honogeneous a mass ot" molten glass, after which the ghss passes through the refining end. the numeral 3 designetes a so-called goose-neck which connects the tank l and the draw-pot l which is supported upon the stools The draw-pot l contains a pool of nolten glass 6 which is reletvely nore shellow than the mess within the tank. The sheet 7 is drewn treni the source 8 in a vertical, plane as is clearly shown. .At a substantial distance 'froni the sheet source 8 it is bent over a so-called bending roll 9 into a horizontal plane where it passes over an idler roll. 10, draw table 11, end through an annealing leer which is not Serial Ne. lgtt'.

shown. 'l`he bendiux roll i) is usuali :termeti 'ti-om some non-corrosive metal alloy such us nichroine or uionel. Sheet edge eiug'ae ine rotts 122, which ere usunll v hnurled, ere prov' d a t both ende ot the sheet source or nenis i R to build up :in cd by nbsorbin bent tlltt'flli'fil'l and tetardinp; movement thereof which will hold the sheet to width etter it hes le'tt its source S. From the tine the @hise leaves the pool (i until it reaches the ben hng roll 9 considerable heat has been dissipated so thnt the sheet is relatively Vis eous and tairly well set. To overcome or prevent breahege or etrains in the sheet as it pasees over the beudin meniher 9, it is advicnblc to apptv bent to the sheet whiie it is being; bent. Urdinariiy un open gas thene is uppiied directly` to the sheet.

lt is an aim ot this invention to apply suiii.- cieut hoat to the sheet being bent to tacili: tate hending thereot, but at the same time the objcctionnhlc feat-ures cncountcred when pievng a pus :deine directly upon the sheet are overcome.

The niuneral 13 desgnates a suitable heating element which :muy be in the nature ot a burner which is provided with -a plurnlity ot small uipertures es is weil UTUiG1`- stood. The burner is cont iined within a coinpartinent l l: separeted froni the co1npartment 15 by e bei-'tle plate 16 having a plurnlty ot openings 17 'torned therein. Positioned within the coinpnrtnient 14: and arranged below the burner 13 is a redintion pinte 18 'which may' be :toi-med froni carborundum or some other suitable material which will absoi'b und rndiate heat from the burner, Whereby the hoat may be radiated 'froni the said plate upon the sheet to sotten the saiinc during the bending* operation. Au edditional advantage ot 'the radieted heart treatment ie that in the old PL'OCCSS ot open :ttaine it was inpossible `to get en even uniform play o't' lame upon the sheet, whereas in the present instunce the plate 18 will be heated to {1, uniiiorm temperature throughout its entire lengtln thue radiatin; an even uni- 'form discherge ot hoat. An adjustable trap door or danper 19 is provided in the upper conpartncnt 15 to teke care ot the products ot coinbustion 'lironi the conpartnent lt Although, but a. single burner 13 is disclosed in the drawing any number of burners mav be utlized depending upon the interi sit-y of heat desired upon the glass at the point Where it is being bent.

It is to be unde'stood that the form of the invention herewith shown and described is tobe taken as the preferred embodinent of the same, and that various ehangesin the shape, size and arrangenent ot' part s may be resorted to Without departing froni the spirit of 'the invention or the scope of the subjoined claim.

Another point to be remembered is that the heat used to soften the glass is loealized and. is not eapahle ot' heating more of the sheet than is necessary. In the ease ot' open flames,` the flames from the bnrners follow along With the sheet in the direction of draw and keep the glass hotter for a longer period than is necessary, thus sometimes permitting other part s of the apparatus eoneting With the sheet to form inpressions therein.

Claim:

In sheet glass apparatus. means .for drawing a sheet 'ironi u mass ot' lnoiten ines. means 'or defleeting the sheet ironi one, plane to another, a gas brner rrmged in proxiniity to the sheet where it is bein bent, and a radiztig' phte between the bnrner and the sheet, siid phte being spaeed froni but paraiiel to ;i piane ian ent to the cnrved path t'm'ersed by the sheet While the sheet is being bent roni ;i vertiezi into a horizontal plane.

Signed :it Charleston. in the eoenty of Kanawha, and State ot YVest Virginia, this 9th day of March, 1925.

LEVVIS D. BLACKSHJCRE. 

